JPH0772079B2 - Arm crane - Google Patents

Description

TECHNICAL FIELD The present invention relates to an arm crane used for moving heavy objects.

(Prior Art) Conventionally, this type of arm crane is disclosed in, for example, Japanese Patent Laid-Open No. 59-1151.
As described in Japanese Patent Laid-Open No. 3 (1994), while supporting a revolving structure on a support column so that the revolving structure is capable of revolving, a revolving structure also supports a suspension arm. While pushing the arm by hand, the arm is pivoted to the position of the heavy object to be moved, the heavy object is locked at the tip of the arm, and then the arm is pushed again to move the heavy object. Is moved to a predetermined moving position.

(Problem to be Solved by the Invention) In the arm crane described above, however, since the suspension arm is freely rotatable with respect to the support column, a heavy object is locked to the arm or the arm is engaged with the arm. In order to move the stopped heavy object to a predetermined position, when the arm is manually pushed and turned, the arm may overrun, which makes it difficult to move the heavy object.
In addition, there is a problem that the arm freely turns due to its own weight when moving heavy objects on a sloping ground.

The present invention has been made in view of the above problems, and an object of the present invention is to provide an arm crane that is excellent in the swinging or stopping of swinging of the arm and the lifting / lowering operability, and that is capable of easily moving heavy objects.

(Means for Solving the Problems) In order to achieve the above object, according to the present invention, a revolving structure (3) is rotatably supported by a support (2), and a driving device (M) is mounted on the revolving structure (3). In the arm crane in which the suspension arm (5) can be moved up and down via the), the swing of the revolving structure (3) with respect to the support column (2) is provided between the support column (2) and the revolving structure (3). While a brake (9) for blocking is provided, an operation handle (10) for performing a turning operation of the revolving structure (3) and a drive control of the drive device (M) is provided at a tip end portion of the suspension arm (5). At the same time, the operating handle (10) is provided with an operating body (11) for braking the brake (9).

(Operation) According to the arm crane of the present invention, the operation handle (10) provided with the operation body (11) enables the swinging or turning stop operation of the swinging body (3) and the lifting operation of the suspension arm (5). I can do it.

That is, hold the operating handle (10) with one hand,
By pushing the operation handle in the turning direction of the swinging body (3) while operating the operating body (11), the brake (9) is released, and the suspension arm (5) is moved to the swinging body (3). ) With respect to the column (2),
When the arm (5) is pivotally moved to a predetermined position,
By releasing the operation of the operation body (11), the brake (9) is activated, and the suspension arm (5) and the swing body (3) are reliably stopped and fixed at a predetermined swing position. The brake (9) is always kept in a braking state except when the operating body (11) is operated, and the arm (5) is fixed to the column (2) side.
Even when working on a sloping ground, the arm (5) is prevented from freely turning.

On the other hand, even when the suspension arm (5) is moved up and down, the drive device (M) of the suspension arm (5) can be immediately driven and controlled only by operating the operation handle (10). is there.

(Embodiment) FIG. 1 shows a balanced arm crane to which the present invention is applied, in which a base (1) provided with a plurality of moving wheels (1a) at a lower portion thereof has a column (2) extending upward. And supports the revolving structure (3) freely on the upper side of the support column (2) through a plurality of angular bearings (B), and vertically inward the revolving structure (3). The extending screw shaft (4) is rotatably supported via a plurality of angular bearings (B), and a piece body (6) for supporting a suspension arm (5), which will be described in detail later, is supported on the screw shaft (4). While being screwed, the upper side of the screw shaft (4) is a drive unit (M) including an electric motor mounted on the revolving unit (3) via a speed reduction mechanism (D) and a transmission mechanism (E). And the rotation of the screw shaft (4) according to the drive of the drive device (M),
The piece body (6) is moved vertically.

The arm (5) includes two first and second arms (51) (5) extending from the revolving structure (3) in a substantially horizontal direction.
2) and two third and fourth arms (53) (54) extending parallel to the respective arms (51) (52) in the intersecting direction.
And the first to fourth arms (51) to (54) constitute a parallel link mechanism.

That is, one end side in the length direction of the first arm (51) is swingably supported on the piece body (6) via a pivot shaft (S1),
The third arm (53) extending in the intersecting direction via a pivot shaft (S2) is swingably supported near the bridge body (6) of the first arm (51), and the third arm is also supported. (Five
At the lower end of 3), one end of the second arm (52) in the longitudinal direction is swingably supported via a pivot shaft (S3), and the supporting portion is horizontally supported by the revolving structure (3). While movably placed on the provided support guide (55), the fourth arm (54) extending in the intersecting direction is provided on the other end side in the length direction of the first and second arms (51) (52). Axis (S4) (S5)
It is allowed to swing freely via. A support bracket (56) is swingably supported on the lower end side of the fourth arm (54) through a pivot shaft (S6), and the drive device is attached to the lower side of the bracket (56). An operation box (7) having a power switch (7a) for controlling the start and stop of (M) is fixed, and a hook (8) for locking a heavy object is attached to the lower surface side of the box (7).

Then, when the heavy object is locked to the hook (8) and lifted and moved, the load of the heavy object is divided into a horizontal component force and a vertical component force to be supported. The vertical component force is shared by the pivot shaft (S1) and the horizontal component force is shared by the pivot shaft (S3).

Thus, in the above arm crane, a brake (9) is interposed between the support column (2) and the revolving structure (3) to prevent the revolving structure (3) from freely rotating with respect to the support structure (2). At the same time, an operation handle (10) for turning the suspension arm (5) is attached to the operation box (7), and an operation body (11) for controlling the brake (9) is attached to the handle (10). It was provided.

More specifically, for example, an electromagnetic brake is used as the brake (9), that is, as shown in FIG. 2, the column (2) is protruded inward from the revolving structure (3). A rotating plate (91) that is integrally rotated with the supporting column (2) is coupled to the protruding tip part of the supporting column (2) through a cylindrical body (92), and is also attached to the upper and lower parts of the rotating plate (91). ,
A pair of upper and lower first and second fixed plates (93a) (93b), which cannot rotate relative to the rotary plate (91), are supported by a support rod (94) at a predetermined interval, and the second fixed plate is provided. (93b) first
It is movable along the support rod (94) with respect to the fixed plate (93a), and the brake shoes (95) are respectively provided between the fixed plates (93a) (93b) and the rotary plate (91). (9
5) intervene.

Further, the bottom wall of the revolving structure (3) and the second fixing plate (93
An electromagnetic coil (96) is disposed between the revolving structure (3) and the revolving structure (3) at a plurality of outer circumferences of the electromagnetic coil (96).
A plurality of coil springs (97) are respectively interposed between the bottom wall side of the coil spring and the second fixing plate (93b), and when the electromagnetic coil (96) is not energized, the coil springs (97) are ) Pushes the second fixed plate (93b) upward to apply a braking force to the rotary plate (91) through the brake shoes (95), and the revolving structure for the support column (2). (3) is prevented from freely rotating, while the second fixed plate (93b) resists the coil spring (97) when the electromagnetic coil (96) is energized. ) Away from
The braking force of the rotating plate (91) by the brake shoe (95) is released to allow free rotation of the revolving structure (3) with respect to the column (2).

Further, as is apparent from FIG. 3, the operation box (7) has two leaf spring members (13) extending in parallel in a substantially horizontal direction on the inner lower side of the operation box (7) through a support (12). )
The operation handle (10) having a substantially U shape protruding outward from the opening window (71) of the box (7) is fixedly supported on the outer end side of each leaf spring member (13). At the same time, the operating body (11) consisting of a touch switch is attached to the inside of the handle (10), and the operating body (11) is operated by one hand holding the handle (10), The electromagnetic coil (96) of the brake (9) can be turned on and off.

Further, the handle (10) is provided inside the box (7).
A differential transformer (15) is arranged at an upper position on the base end side of the through a support (14) extending in the horizontal direction.
5) By vertically moving the iron core (16) inserted in the inside by operating the handle (10), the current displacement of the transformer (15) is amplified by the amplifier (A), and the inverter (IN)
To the drive device (M) side, and the drive device (M) is rotated in the forward and reverse directions at a speed according to the vertical operation amount of the handle (10), and is passed through the screw shaft (4). The frame body (6) is moved up and down, and the entire arm (5) is moved up and down at an arbitrary speed accordingly.

Next, the operation of the arm crane configured as described above will be described.

First, when moving a heavy object, by grasping the operation handle (10) with one hand and operating the operation body (11) with the hand grasping the operation handle (10),
When the brake (9) is released, the revolving structure (3) is free to revolve with respect to the support column (2), and the handle (10) is pushed in the revolving direction of the revolving structure (3) in such a state. As a result, the suspension arm (5) is pivotally moved to a predetermined position together with the revolving structure (3), and then the operation (11) is released to operate the brake (9). Then, it is stopped and fixed at a predetermined turning position.

Also, after the entire arm (5) is pivotally moved to a predetermined position, the operation handle (10) is pushed downward so that the arm (5) passes through the drive unit (M). After the heavy object is locked to the hook (8), the heavy object locked to the hook (8) via the arm (5) by the upward movement of the handle (10). Is lifted, and thereafter, the heavy object is moved to a predetermined moving position in the same manner as described above.

In the embodiment shown in FIG. 1, a first link (17) is arranged in parallel with the arm (51) on the upper side of the first arm (51) which constitutes the arm (5), One end in the length direction of the link (17) is swingably supported by the bridge body (6) through a pivot shaft (S7), and the tip end side of the first arm (51) and the fourth arm ( 54) The pivot shaft (S4) that supports and
A bracket (18) having a substantially triangular shape is supported on the upper side, and the other end in the longitudinal direction of the first link (17) is pivotally supported (S8) at one protruding end of the bracket (18). On the other hand, the bracket (18) is supported on the other projecting end portion via the pivot shaft (S9) of the second link (19) extending parallel to the fourth arm (54), The lower end of the second link (19) is supported by the bracket (56) fixed to the upper side of the operation box (7) via a pivot shaft (S10).

With the above structure, when the hook (8) is engaged with a heavy object to perform lifting movement,
7) Through the (19), the heavy object can be always maintained in the horizontal position.

In the above embodiments, the balancing crane has been described, but the present invention can be applied to, for example, a jiff crane,
Further, although the motor is used as the drive unit (M) for moving the arm (5) up and down, it can be used as an air-type drive source instead of the motor. Further, in the embodiment, the base is used. Although a plurality of traveling wheels (1a) are provided on the lower side of (1) to make it movable, the present invention can also be made stationary.

Further, in the above embodiments, the electromagnetic brake is used as the brake (9), but a mechanical brake or the like may be used.

(Effect of the invention) As described above, in the arm crane of the present invention, the revolving structure (3) is rotatably supported on the column (2), and
In an arm crane in which a suspension arm (5) is vertically movable on the revolving structure (3) via a drive unit (M), the revolving structure (3) is provided between the support column (2) and the revolving structure (3). 3)
While a brake (9) is provided to prevent the swinging of the swinging column (2) with respect to the column (2), the swinging operation of the swinging body (3) and the drive unit (M) are provided at the tip of the suspension arm (5).
The operation handle (10) for controlling the driving of the vehicle is provided, and the operation handle (10) is provided with the operation body (11) for braking the brake (9), thereby providing the operation body (11). Just by operating the operating handle (10),
Not only can the swinging body (3) swing or stop swinging, but also the lifting arm (5) can be lifted and lowered in a series, and as a whole, the swinging or swinging of the arm and the lifting and lowering operability are excellent, and movement of a heavy object is possible. Easy to work with.

[Brief description of drawings]

FIG. 1 is a partially cutaway side view showing the entire structure of an arm crane according to the present invention, FIG. 2 is an enlarged sectional view showing an example of a brake used in the arm crane, and FIG. 3 is used in the arm crane. It is an expanded sectional view showing the operation handle portion. (2) …… Post (3) …… Revolving unit (5) …… Suspending arm (9) …… Brake (10) …… Operating handle (11) …… Operating body (M) …… Drive unit

Claims (1)

[Claims] 1. An arm in which a revolving structure (3) is rotatably supported on a column (2), and a suspension arm (5) is provided on the revolving structure (3) via a drive unit (M) so as to be able to move up and down. In the crane, a brake (9) is provided between the support column (2) and the swing structure (3) to prevent the swing structure (3) from swinging relative to the support column (2), while the suspension arm (5) is provided. An operation handle (10) for performing a revolving operation of the revolving structure (3) and a drive control of the drive device (M) is provided at the tip of the, and the brake (9) is provided on the operation handle (10). An arm crane provided on an operating body (11) for braking operation.